This is a Windows system installed file with Windows File Protection (WFP) enabled.

What is UrlMon.dll?

Urlmon.dll is part of Microsoft Internet Explorer and offers functionality for MIME handling and code download. Internet Explorer uses two mechanisms for registering new URL protocol handlers. The first method is to register a URL protocol and its associated application so that all attempts to navigate to a URL using that protocol launch the application (for example, registering applications to handle mailto: or news: URLs). The second method uses the Asynchronous Pluggable Protocols API, which

About UrlMon.dll (from Microsoft)

“Asynchronous pluggable protocols enable developers to create pluggable protocol handlers, MIME filters, and namespace handlers that work with Microsoft Internet Explorer 4.0 and later and a URL moni”

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